Alright, let's work through 1387 times 1016 step by step
1387 × 1016 = 1016 × (1387)
+ 1016 × 7 what gives us 7112
+ 1016 × 80 that equals 81280
+ 1016 × 300 yielding 304800
+ 1016 × 1000 that is equal 1016000

= 1409192
